Ambient Machine files and code

Ambient_Machine/code.py

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+# SPDX-FileCopyrightText: 2023 John Park
+#
+# SPDX-License-Identifier: MIT
+# Ambient Machine inspired by Yuri Suzuki https://www.yurisuzuki.com/projects/the-ambient-machine
+import os
+import board
+import busio
+import audiocore
+import audiobusio
+import audiomixer
+from digitalio import Pull
+from adafruit_debouncer import Debouncer
+from adafruit_mcp230xx.mcp23017 import MCP23017
+
+i2c = busio.I2C(board.SCL, board.SDA)
+mcp_a = MCP23017(i2c, address=0x20)  # default address
+mcp_b = MCP23017(i2c, address=0x21)  # MCP23017 w/ address 0 jumper set
+
+switches = []  # set up all the switch pins on two MCP23017 boards as debouncer switches
+for p in (8,9,10,11,12,4,3,2,1,0):
+    pin = mcp_a.get_pin(p)
+    pin.switch_to_input(pull=Pull.UP)
+    switches.append(Debouncer(pin))
+for p in (8,9,10,11,12,4,3,2,1,0):
+    pin = mcp_b.get_pin(p)
+    pin.switch_to_input(pull=Pull.UP)
+    switches.append(Debouncer(pin))
+
+switch_states = [False] * 20  # list of switch states
+
+wav_files = []
+
+for filename in os.listdir('/samples/'):  # on board flash
+    if filename.lower().endswith('.wav') and not filename.startswith('.'):
+        wav_files.append("/samples/"+filename)
+        print(filename)
+
+wav_files.sort()  # put in alphabetical/numberical order
+
+# Metro M7 pins for the I2S amp:
+lck_pin, bck_pin, dat_pin = board.D9, board.D10, board.D12
+
+audio = audiobusio.I2SOut(bit_clock=bck_pin, word_select=lck_pin, data=dat_pin)
+mixer = audiomixer.Mixer(voice_count=len(wav_files), sample_rate=22050, channel_count=1,
+                         bits_per_sample=16, samples_signed=True, buffer_size=8192)
+audio.play(mixer)
+
+for i in range(10):  # start playing all wavs on loop w levels down
+    wave = audiocore.WaveFile(open(wav_files[i], "rb"))
+    mixer.voice[i].play(wave, loop=True)
+    mixer.voice[i].level = 0.0
+
+
+while True:
+    for i in range(len(switches)):
+        switches[i].update()
+        if i < 5:  # first row plays five samples
+            if switches[i].fell:
+                if switch_states[i+5] is True:  # check volume switch
+                    mixer.voice[i].level = 0.4  # if up
+                else:
+                    mixer.voice[i].level = 0.2  # if down
+                switch_states[i] = not switch_states[i]
+            if switches[i].rose:
+                mixer.voice[i].level = 0.0
+                switch_states[i] = not switch_states[i]
+
+        elif 4 < i < 10:  # second row adjusts volume of first row
+            if switches[i].fell:
+                if switch_states[i-5] is True:  # raise  volume if it is on
+                    mixer.voice[i-5].level = 0.4
+                switch_states[i] = not switch_states[i]
+            if switches[i].rose:
+                if switch_states[i-5] is True:  # lower volume if it is on
+                    mixer.voice[i-5].level = 0.2
+                switch_states[i] = not switch_states[i]
+
+        elif 9 < i < 15:  # third row plays five different samples
+            if switches[i].fell:
+                if switch_states[i+5] is True:
+                    mixer.voice[i-5].level = 0.4
+                else:
+                    mixer.voice[i-5].level = 0.2
+                switch_states[i] = not switch_states[i]
+            if switches[i].rose:
+                mixer.voice[i-5].level = 0.0
+                switch_states[i] = not switch_states[i]
+
+        elif 14 < i < 20:  # fourth row adjust volumes of third row
+            if switches[i].fell:
+                if switch_states[i-5] is True:
+                    mixer.voice[i-10].level = 0.4
+                switch_states[i] = not switch_states[i]
+            if switches[i].rose:
+                if switch_states[i-5] is True:
+                    mixer.voice[i-10].level = 0.2
+                switch_states[i] = not switch_states[i]